MAX1776EUA+ Maxim Integrated Products, MAX1776EUA+ Datasheet

IC DC-DC CONV STP DWN 8-UMAX

MAX1776EUA+

Manufacturer Part Number
MAX1776EUA+
Description
IC DC-DC CONV STP DWN 8-UMAX
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX1776EUA+

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V, 1.25 ~ 24 V
Current - Output
600mA
Frequency - Switching
200kHz
Voltage - Input
4.5 ~ 24 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Power - Output
330mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1776 high-efficiency step-down converter pro-
vides an adjustable output voltage from 1.25V to V
supply voltages as high as 24V. An internal current-limit-
ed 0.4
Operation to 100% duty cycle minimizes dropout volt-
age (240mV at 600mA).
The MAX1776 has a low 15µA quiescent current to
improve light-load efficiency and conserve battery life.
The device draws only 3µA while in shutdown.
High switching frequencies (up to 200kHz) allow the
use of tiny surface-mount inductors and output capaci-
tors. The MAX1776 is available in an 8-pin µMAX pack-
age, which uses half the space of an 8-pin SO. For
increased output drive capability, use the MAX1626/
MAX1627 step-down controllers, which drive an exter-
nal P-channel MOSFET to deliver up to 20W.
19-1975; Rev 2; 7/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
24V, 600mA Internal Switch, 100% Duty Cycle,
Notebook Computers
Distributed Power Systems
Keep-Alive Supplies
Hand-Held Devices
MOSFET delivers load currents up to 600mA.
ILIM2
FB
SHDN
ILIM
Typical Operating Circuit
MAX1776
________________________________________________________________ Maxim Integrated Products
MAX
General Description
GND
OUT
LX
IN
V
Applications
IN
IN
V
OUT
from
o Fixed 5V or Adjustable Output
o 4.5V to 24V Input Voltage Range
o Up to 600mA Output Current
o Internal 0.4 P-Channel MOSFET
o Efficiency Over 95%
o 15µA Quiescent Supply Current
o 3µA Shutdown Current
o 100% Maximum Duty Cycle for Low Dropout
o Current-Limited Architecture
o Thermal Shutdown
o Small 8-µMAX Package
MAX1776EUA
Step-Down Converter
TOP VIEW
PART
GND
ILIM
FB
LX
-40°C to +85°C
TEMP RANGE
1
2
3
4
Ordering Information
MAX1776EUA
MAX
Pin Configuration
7
5
8
6
PIN-PACKAGE
8 µMAX
OUT
ILIM2
IN
SHDN
Features
1

Related parts for MAX1776EUA+

MAX1776EUA+ Summary of contents

Page 1

... ILIM LX MAX1776 ILIM2 OUT FB GND MAX ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Step-Down Converter o Fixed 5V or Adjustable Output from IN o 4.5V to 24V Input Voltage Range 600mA Output Current o Internal 0 ...

Page 2

... LX Switch On-Resistance R LX Current Limit I LX(PEAK) LX Zero-Crossing Threshold Zero-Crossing Timeout LX Switch Leakage Current Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________ Continuous Power Dissipation (T 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW + 0.3V) IN Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65° ...

Page 3

Internal Switch, 100% Duty Cycle, ELECTRICAL CHARACTERISTICS (continued) = +12V, SHDN = IN, T (Circuit of Figure PARAMETER SYMBOL Dropout Voltage V DROPOUT Line Regulation Load Regulation Digital Input Level Digital Input Leakage Current ILIM ...

Page 4

Internal Switch, 100% Duty Cycle, Step-Down Converter ELECTRICAL CHARACTERISTICS (continued) = +12V, SHDN = IN, T (Circuit of Figure PARAMETER SYMBOL LX Zero-Crossing Threshold LX Switch Leakage Current Digital Input Level Digital Input Leakage Current ...

Page 5

Internal Switch, 100% Duty Cycle, (Circuit of Figure 1, components from Table vs OUTPUT IN CIRCUIT OUTPUT 0 10mA LOAD I = 1mA LOAD 0.2 0 -0.2 ...

Page 6

Internal Switch, 100% Duty Cycle, Step-Down Converter (Circuit of Figure 1, components from Table 3, V QUIESCENT SUPPLY CURRENT vs. TEMPERATURE 18.0 17.5 17.0 16.5 16.0 15.5 15.0 -40 -20 0 TEMPERATURE ( C) PEAK SWITCH CURRENT vs. ...

Page 7

Internal Switch, 100% Duty Cycle, (Circuit of Figure 1, components from Table WAVEFORM, CIRCUIT 15V OUT EFFICIENCY vs. I 100 ...

Page 8

Internal Switch, 100% Duty Cycle, Step-Down Converter PIN NAME Dual-Mode Feedback Input. Connect to GND for the preset 5V output. Connect to a resistive divider 1 FB between OUT and GND to adjust the output voltage between 1.25V ...

Page 9

Internal Switch, 100% Duty Cycle SHDN ILIM ILIM SET ILIM2 Figure 2. Simplified Functional Diagram LX WAVEFORM, CIRCUIT 15V 500mA IN LOAD OUT 2 s/div ...

Page 10

Internal Switch, 100% Duty Cycle, Step-Down Converter Shutdown ( logic low level on SHDN shuts down the MAX1776 converter. When in shutdown, the supply current drops to 3µA ...

Page 11

Internal Switch, 100% Duty Cycle, Inductor series resistance affects both efficiency and dropout voltage (see Input-Output (Dropout) Voltage). High series resistance limits the maximum current avail- able at lower input voltages, and increases the dropout voltage. For optimum ...

Page 12

Internal Switch, 100% Duty Cycle, Step-Down Converter Table 3. Recommended Components MAXIMUM INPUT LOAD CIRCUIT VOLTAGE CURRENT (V) (mA 600 300 150 ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2003 Maxim Integrated Products Step-Down Converter board and integrate it into a pseudo-ground plane ...

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